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Table 4 Opening distance and angle of the osteotomy gap during two operations

From: Salvage of severe knee osteoarthritis: efficacy of tibial condylar valgus osteotomy versus open wedge high tibial osteotomy

  HTO TCVO p value
MPTA (°) 7.9 ± 2.3 9.3 ± 3.2 < 0.05
Opening distance (mm) 10.1 ± 2.9 14.0 ± 4.5 < 0.01
Opening distance per MPTA (mm) 73.6 ± 4.1 86.4 ± 2.7 < 0.01
Opening angle (°) 9.3 ± 2.5 19.1 ± 5.8 < 0.01
Opening angle per MPTA 1.2 ± 0.1 2.1 ± 0.2 < 0.01
  1. MPTA the change of MPTA after each surgery (MPTA = post-operative MPTA−pre-operative MPTA), opening distance the distance between the intersections of the osteotomy lines with the medial cortex during gap opening, opening distance per MPTA = opening distance × 180÷(MPTA × π), opening angle the angle formed between two osteotomy lines after osteotomy gap opening, opening angle per MPTA = opening angle ÷ MPTA